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题型:阅读理解-单选 难度:0.65 引用次数:27 题号:22117129

If you feel stressed at school, what can you do to make yourself happier? Some may eat their favorite food or listen to some music. Others may go for a walk or get some exercise. A new study found another great way to lower students’ stress—playing with dogs.

Scientists studied 105 students between the ages of eight and nine. Thirty-five trained dogs and their trainers also took part in the test. The children were divided into 3 groups. The students in the first group spent 20 minutes with a dog and its trainer. They watched the trained dogs perform and even played with them. They did this twice a week for 4 weeks. The second group spent the same amount of time (时长) doing exercise to relax. The last group did neither of these things.

During this time, the scientists recorded the students’ cortisol levels (皮质醇水平). Cortisol is a stress hormone (激素). The more stressed you feel, the more cortisol you will have in your body. What did the scientists find? Both the second and the third groups showed rises in cortisol levels. The first group, however, showed no big increase. And the children in this group had the lowest cortisol levels right after playing with the dogs.

According to the study, students enjoy playing with dogs, and it helps them become happier. The stress hormone falls over time this way, which is good for students’ health. But here comes the next question: Is 20 minutes of playtime with a dog the best amount of time? Scientists are going to keep working to find out the answer.

1. What is the purpose of the first paragraph?
A.To lead in the topic.B.To present the argument.
C.To shock the readers.D.To show the latest research results.
2. Which one shows the relationship between students’ stress (x) and cortisol levels (y)?
A.B.C.D.
3. What made the testing results of the three groups different?
A.The time.B.The age.C.The activity.D.The place.
4. What may the scientists study next?
A.More useful ways to lower stress.
B.New skills of keeping pets at home.
C.The best amount of time to play with a dog.
D.The most suitable kind of dog to play with.
【知识点】 科普知识 说明文

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【推荐1】Do you often feel tired? Do you sometimes feel uncomfortable on your neck and back? It may because of the radiation (辐射) from your computer. If you spend three hours or more in front of a computer, you may feel terrible because of the radiation.
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6.Keep your monitor at least 50 cm away from your face.
7.Allow fresh air to move around your computer room.
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B.Being busy only on the computer.
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D.Sleeping too much in a day.
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C.To tell why there is radiation.
D.To tell the importance of radiation.
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Although fish may not sleep like people, they do rest. One way to know if a fish is resting is to watch what it is doing.     2     Some fish move at the bottom (底部) of the water. Some move slowly near the top of the water.

You can know some fish are resting because they stay in one place.     3     For example, some sharks (鲨鱼) keep swimming so that they can breathe in the water. Although these sharks are always swimming, they may still be resting.     4     The organ (器官) allows them to keep their body moving while they are resting.

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③ xiaoxue               c. It is the day with the year’s longest daytime.
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共计 平均难度:一般